[GRASS-user] v.in.ogr imports some areas of shapefile twice or more

[Moritz Lennert]

On 31/07/08 10:03, Tim Michelsen wrote:
> Hello,
> I have a shapefile containing 150 polygons.
> 
> After importing this shapefile with v.in.ogr and then adding it to a qgis prject
> I observe that it has more polygons than the original data source.
> I tested it by overlaying the original shapefile in QGIS as a normal (non-GRASS)
> vector.
> 
> This is really strange. What could be the cause for this?

It could be the result of the cleaning process done by v.in.ogr. If 
overlaps or slivers are large enough GRASS will make polygons out of 
them. You can control the size threshold with the 'min_area' parameter.

Moritz